This article is cited by the ACSM GETP:
Bryarly M, Phillips LT, Fu Q, Vernino S, Levine BD. Postural Orthostatic Tachycardia Syndrome: JACC Focus Seminar. J Am Coll Cardiol. 2019 Mar 19;73(10):1207-1228.
https://www.jacc.org/doi/abs/10.1016/j.jacc.2018.11.059
The supplement to this article contains a detailed exercise program, including a calendar with progressions. Here is the link:
https://www.jacc.org/doi/suppl/10.1016/j.jacc.2018.11.059/suppl_file/mmc1.docx